Pot type liquid fuel burner and air supply means therefor



Aug. 14, 1945. M. p. HUSTON 2,332,419

I POT TYPE LIQUID FUEL BURNER AND 1218 SUPPLY MEANS THEREFOR Filed June 26. 1942 any suitable outer housing, which may forexinlets II. The result is an upward delivery of -from the floor or surface upon which it is sup- If desired. the pil t rin 20 m y be employed,

Patented Aug-14,1945 2,382,419

UNITED STATES PATENT, OFFICE r POT TYPE LIQUID FUEL BURNER AND AIR SUPPLY MEANS THEREFOR Milton p. Huston, Chicago, lll., asslgnor to on Devicw, Santa Fe, N. Mex, a limited partnership of J Y 1 Application June as, mason-n1 No. 448,539

The invention relates to an improvement in ing out upon the floor I from the line 8 will be burners and particularly to pot type burners. vaporized by the heat of combustion occurring One purpose is to provide improved flame above the fuel in or above the pot. The vapropagafing means whereby quieter operation porized hydrocarbon rises in the pot and mixes and flame stabilization are obtained. with air flowing in through the primary air inlet Another purpose is toprovide improved means apertures to form a preliminary or primary mixfor delivering secondary air whereby quieter op-' ture. This primary mixture then receives a superation is obtained. Ply of secondary air through an upper row of Other purposes will appear from time to time secondary air inlets l6, which are herein shown in the course of the. specification. 10 as adjacent the top of the pot. A lower row of The invention is illustrated more or less diasomewhat smaller and less closely spaced secgrammatically in the accompanying drawing ondary air inlet apertures I7 is. employed. wherein: I The secondary air inlet apertures I1 is a baflle Fig. 1 is a vertical axial section through a ring or sleeve I 8, which is spaced inwardly someheater illustrating the invention; what from the wall of the pot by any suitable Fig. 2 is a similar partial section'on an enspacer It. It will be realized, of course, that, larged scale; whereas separate layers of sheet metal are shown, Fig. 3 is a partial vertical section through a a single integral member may, if desired; be variant form of the device; and employed, which may vary in size and shape.

Fig. 4 is a section on the line 4-4 of Fig. 3. -What is essential is that the members l8or 19, Like parts are indicated by like symbols or their equivalent, provide a space the bottom throughout the specification and drawing. of which is closed and the interior of which is Referring to thedrawing, .I generally indicates in communication with the lower secondary air ample be in the form of a cylindrical drum. It, secondary air at relatively low velocity toward may be supported by any, suitable'means, for the bases or bottoms of the jets of secondary air example the bottom ring 2, having a plurality which pass inwardly through the secondary air of feet 3, which space the structure upwardly inlets l6.

portedand permit air to flow thereb ath, a located in a lower portion of the pot and supis a bottom partition having a central aperture port d for e a p upon supportin stu s or 5 foradmissiono! air to the s ac within th rivets 2| andprovided with the secondary pasdrum l. 1 sage 22. It will be observed that the ring 20 5 illustrates a burner pot having a'more r is' located above the lowest of the primary air less concave bottom I. I is any suitable liquid inlets l5, and provides a small or pilotburner fuel inlet line, the flow of fuel along which may when the rate of combustion is reduced, by subbe varied or controlled by any suitable means stantially diminishing the rate of flow of fuel not herein shown and not of itself forming t inwardly along the line 8. When the burner is of the present invention. Illustrated for examemployed at t p t sta the flam D P ole is a conventional float chamber a. It will be 40 eatin baffle sl eve is not p rf rmin any fu understood that, either auto tically or m n tion, as combustion takes place only in the lower ually, the flow of fuel-along the line 8 is con-, p n of the n owever, t hi h fire the trolled, and thereby the combustion within the liquid fuel .is supplied at such a rate that all. pot 6. The pot I is provided with an upper flange of the primary air inlet apertures 15 are necesm, which may rest upon a supporting-ring l i sary to complete the primary mixture, and comextending inwardly from the wall of the drum 9. V 'bustion takes place at or above the ring It. The It will be understood that the space above the jets of air, flowing inwardly rom th Secondary ring .I I and above the top of the pot 8 provides air inlet apertures I! provide the necessary seca combustion chamber, ondary air for complete combustion, and the A flame ring I! may be emplo d, th e tr l flame rises upwardly through the aperture l4 aperture ll of which connects th int ri r of and into the combustion chamber above the pot the pot 6 with the interior of the combustion d Within the lower Portion of h d chamber. The walls of the pot are provided At the hi h. sta e, in pot y e burners f he with a. plurality of primary air inlet apertures type herein shown, under some circumstances l5. It will be understood that liquid fuel passthere is a tendency to noisy combustion. The

flame dances or flashes back and forth to and from the wall of the pot, along the axis of delivcry of the jets from the inlets I6. I flnd that I obtain efficient flame propagation, under all conditions, by addinga small amount of additional secondary air, which preferably is delivered at low velocity upwardly toward the bases of the air jets. The result is quiet operation and a stabilized flame regardless of the velocity of the secondary air.

Referring to Figs. 3 and 4, I illustrate a variant form of the device in which the pot 6a is provided, adjacent its top, with an outwardly extending shoulder 50 and an upwardly extending portion 5| of somewhat greater diameter than the pot 6a. The secondary air inlets I611 are provided in the pot portion 59. Air inlets ,lla are located in the generally horizontal or outwardly extending portion 50. Thus, instead of employing the directing sleeve I8, I direct the air upwardly by varying the formation of the pot. I

may also employ under some circumstances an exterior expansion chamber, which may for example be formed by an angle member 52, having a bottom wall 53 provided with a plurality of air inlet apertures 54. v

- It will be realized that, whereas a practical and operative device has been described and illustrated, nevertheless many changes may be made in the size, shape, number and disposition of parts without departing from the spirit of the invention. It is therefore wished that. the description and drawing be taken as in a broad sense illustrative or diagrammatic, rather than as a limitation to theprecise showing.

For example, whereas the secondary air is shown as admitted through a plurality of air inlets l8 located below the top of the pot, other means may beemployed for admitting the secondary air through the wall of the pot or over the top of the pot. What is essential is that what- I ever means are employed, additional secondary air is delivered at relatively low velocity upwardly along a path or paths intersecting the secondary air jets.

The invention is illustrated as applied to a pot type burner in which the axis of the pot is vertical and liquid fuel is delivered to the bottom of the pot. It is equally applicable, however, to pot type burners in which the axis of the burner is horizontal or at an angle to the vertical. It may be applied, for example, to such structures as are shown in the co-pending James L. Breese' and Bruce Hayter application Serial No. 442,414, filed in the United States'Patent Offlce on May 11,

1942, which is assigned to the same assignee and which has matured into Patent No. 2,348,721,

dated May 16, 1944. It may also be employed with gaseous fuel, such as natural gas.

An important advantagein the present invention is the provision of substantially noiseless combustion. This is particularly important in pot type burners which are frequently employed in relatively light structures used asspace heaters and therefore present in the space or room to be heated. In a pot type burner such as-shown in' the present drawing, jets of inflowing air, such as flow from the apertures l8, mixfwith the vaporized hydrocarbon in the combustionchamber and form pencils or jets of flame. It is important to k the base of each such flame solidly against the wall of the pot. As soon as the base of the flame moves away from the pot wall, it vibrates back and forth and sets up a series of sound velocity is far below the flame velocity and therefore the base of the flame never leaves the side wall of the burner. I have therefore provided a very simple method and apparatus for silencing burners which are particularly adaptable to pot type burners burning liquid hydrocarbon fuels.

What is claimed is: p

1. In a pot type burner, a burner pot having a closed end and an open end, and a circumferential wall, said wall having a plurality of primary air inlet apertures spaced circumferentially thereabout at various distances from the closed end of the wall, means for delivering a liquid fuel to the 1 interior of the pot'for vaporization, the wall of the pot adjacent the open end being provided with a plurality of secondary air inlet apertures arranged circumferentially about the pot, and means for delivering a flow of air directly across said apertures, closely along the inner face of the pot wall, including a ring slightly inwardly spaced from theinner face ofv the pot wall and adjacent but vertically out of line with the secondary air inlet apertures, the space between the pot wall and the edge of the ring away from the secondary air inlet apertures being closed, the pot wall having apertures in communication with the space between said ring and. the pot wall, said ring being located on the side of the secondary air inlet apertures away from the open end of the pot, whereby the air delivered by said ring is directed toward the open end of the pot.

2. In a pot type burner, a burner pot having a closed end and an open end, and a circumferential wall, said wall having a plurality of primary air inlet apertures spaced circumferentially thereabout at various distances from the closed end of the pot, means for delivering a liquid fuel to the interior of the pot for vaporization, the wall of the pot adjacent the open end being provided with a plurality of secondary air inlet apertures arranged circumferentially about the pot, and means for delivering a flow of air directly across said apertures. closely along the inner face of the pot wall, and in the direction of the open end of the port. 1

3. In a pot type burner, a burner pot having a closed end and an open end, and a circumferential wall, said wall having a plurality of primary air inlet apertures spaced circumferentially thereabout at various distances from the closed end of the pot, means for delivering a liquid fuel to the interior of the pot for vaporization, the wall of the pot adjacent the open end being provided with a plurality of secondary air inlet apertures ar- .60

ranged circumferentially about the pot, and means for delivering a flow of air directly across said apertures, closely along the inner face of the pot wall, and in the direction of the open end of the pot, and a centrally apertured flame ring partially closing the open end of the pot.

4. In a pot type burner, a burner pot having a closed end and an open end, and a circumferential I wall, said wall having a plurality of primary air inlet apertures spaced circumferentially thereabout at various distances from the closed end of {the pot, means for delivering a liquid fuel to the closed end of the pot for vaporization, the wall of the pot adjacent the open end being provided with a plurality of rows of secondary air inlet apertures waves. is a major cause of noisy burners. arranged i mf nt lly bout the not, such secondary air inlet apertures being more closely spaced, circmnferentially, than the primary air inlets, and means for directing air upwardly to the bases of the jets inflowing through an upper row of said secondary air inlets, including an annular, generally cylindrical baflle mounted on the pot wall and defining, with the pot wall, a space in communication with a-lower row of the secof the pot, and means for delivering additional air upwardly toward the bases of the jets flowing into the pot through said secondary air inlets,

said secondary air inlets being inclined towardthe open end of the pot.

6; Ina pot type burner, a burner pot having a circumferential wall, an open end and a closed end 25 wall opposite said open end, means for delivering fuel on to said closed end of the pot said circumferential wall having therein a plurality of circumferentially spaced primary air inlets located at various distances from the ends of the pot, and having a plurality of circumferentially spaced secondary air inlets located adjacent the open end of the pot, and means for delivering additional air upwardly toward the open end of the 'pot and toward the bases of the Jets flowing into the pot through said secondary air inlets.

7. In a pot type burner, a burner pot having a circumferential wall, an open end and a closed end wall opposite said open end, means for delivering fuel on to said closed end of the pot said circuinferential wall having therein a plurality of circumferentially spaced primary air inlets located at various distances from the ends of the pot, and having a plurality of circumferentially spaced secondary air inlets located adjacent the open end oi the pot, and means for delivering additionalair upwardly toward the open end of the pot and toward the basesof the-jets flowing into the pot through said secondary air inlets, including an annular baflle mounted on the inner wall of the MILTON D. HUSTON. 

